Shars 8" 4 Jaw Independent Lathe Chuck with TIR Certification New R[

 

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Shars 8" 4 Jaw Independent Lathe Chuck with TIR Certification NewEach high quality chuck comes with a certificationProduct Description

 

MFG SKU # 202-5421 Brand Shars Tool Thru Hole Size 2.205 Bolt Circle Diameter 3.740 TIR (INCH) 0.0039 Number of Jaws 4 Max Capacity 7.87 Lathe Chuck Category Independent Lathe Chucks Chuck Diameter 8 Mounting Plain Back Chuck Thickness 3.070 Jaw Movement Independent Maximum RPM 2100 Min Capacity 0.394

 

  Product Application

For use gripping odd shaped work

Product Features                      

•  A matching back plate (sold separately) would need to be machined on the face and hub OD in order to fit this chuck. For detailed information, please look for the Shars back plate machining guide.
• Accuracy is maintained for the entire clamping range
• Semi-steel chuck body made from high quality cast iron

• Four operating screw design with each ground and hardened to HRC 43
• Both side of jaw teeth and guides are ground and hardened to HRC 58-62

• Four jaws allow a square component to be perfectly centered to the chuck while achieving maximum gripping force
• Each set of jaws are serialized in their own set
• A serialized set of jaws are then finished, ground, and lapped on their designated chuck body which will be the same chuck body on the final assembly to achieve a greater accuracy

• Before assembling the jaw to its designated chuck body, the jaw's finish machining are performed on a closed tolerance state of the art CNC machine from Japan

• Operating screw's thread flank are ground on both side to achieve a tighter contact with the master jaw
• Each chuck has gone through rigorous accuracy and repeatability inspection with clamping and jamming multiple random testing rods or rings

• plain back mounting

  Clamping Range:

• Internal Jaw:
  • Clamping Range A-A1: 0.393-3.937"
  • Clamping Range B-B1: 2.480-7.874"

 

                    What's Included

• Included 1 Set of Reversible Solid Hard Jaws
• 4 PCS of M10 Mounting Screws
• 1 Lathe Chuck Key
• Inspection report on runout on both inside and outside jaws

 

Related Products

 

SKU: 202-7491 SKU: 202-6203 7.12" D1-5 Fully Machined Lathe Chuck Back Plate for 8" Independent Chuck 6.3" Threaded Back Plate with 1-1/2 x 8 TPI for 8" 4 Jaw Independent Chuck

 

SKU: 202-2031 SKU: 202-7490 SKU 202-8073 3/8" Self-Ejecting Lathe Chuck Key

6.3" D1-4 Fully Machined Lathe Chuck Back

Plate for 8" Independent Chuck

10mm Lathe Chuck Key

 

When you pick fully machined back, please follow the following instruction.

How to process back plate to guarantee Chuck's T.I.R?

The fully-machined chuck back plates can be mounted onto 8" 4 jaw independent lathe chuck (p/n 202-5421). 

All back plates have 0.04" allowance, please measure the size of Chuck's D1 before process your back plates. The size of back plates's D1 should be a little bit smaller than the size of Chuck's D1. Because the gap between back plate and chuck is smaller, chuck's TIR is better. No gap is the best. 

You would not need to drill any mounting holes but you will need to turn the shoulder down .040" to match the back of the lathe chuck to make the chuck & back plate more concentric with the lathe spindle. When turning the shoulder of the backing plate, ONLY TURN THE SHOULDER OF THE BACKING PLATE WHEN ATTACHED TO THE LATHE SPINDLE. If you use a chuck to clamp the backing plate and then turn it, the backing plate will not be true to the lathe spindle and will have more runout than specified when the chuck and back plate are put together. 

 

 

 

  We have other chucks & back plates available at My Ebay Store :              

SHIPPING: UPS Ground

Buyer pays ACTUAL UPS shipping & insurance, and a $3.00 handling fee for this item to be shipped to all states within the continental United States. Hawaii, Alaska & and other United States Territories will ship via UPS BLUE. Canada will pay actual shipping costs plus duty fees via UPS. 
We can combine other auctions or store items to save on shipping. You may ask for freight cost before buying tools. Shipment will be made the same day as your payment is received and an UPS tracking number will be email to you. If your order is being shipped to an address outside of the United States, local consumer tax and/or customs duty , brokerage charges may apply and the package's recipient may need to pay these to clear customs.

PAYMENT:

We accept VISA, MasterCard and E-Check on PayPal.com
Illinois resident adds 8% sales tax.

RETURNS:

If the item stated as brand new is found defective on arrival or incorrect item was shipped, buyer understands that the product will be repaired or replaced at seller's discretion, and be given a reasonable amount of time. Buyer is responsible for return shipping costs and insurance. Warranties are offered by the manufacturer and will be honored by the manufacturer. All shipping and handling fees will not be returned in any case.